Xu Ang
Hinese court astronomer
From Wikipedia, the free encyclopedia
Xu Ang (Chinese: 徐昂; pinyin: Xú Áng) was a Chinese court astronomer of the Tang dynasty.[1]
Shortly after Emperor Xianzong's ascension in 805, he created the Guanxiang Calendar (觀象曆), which was used throughout Emperor Xianzong's reign beginning in 807.[1]
In 822, during Emperor Muzong's reign,[1] he created the Xuanming calendar,[2] one of the most influential calendars in the world. It was used for 71 years in China, for at least 475 years in Korea, and for 823 years in Japan.[3]
